Fabulous vintage pin with a fiery red, enameled guilloche pattern laid on sterling silver. Based on the design, markings, and clasp, it was very likely made in the 1920's or 30's. Marked "STERLING" with what appears to be a "G" makers mark next to it. This is the most elaborate guilloche pattern I have ever seen on a brooch/pin of this type. In great, original condition.